EPNG is herein providing supplemental environmental information, including certain attachments, intended to clarify previously submitted data.

Transcription

1 September 19, 2018 Federal Energy Regulatory Commission 888 First Street, N.E. Washington, D.C Attention: Ms. Kimberly D. Bose, Secretary Re: El Paso Natural Gas Company, L.L.C.; Docket No. CP Supplemental Environmental Information Dear Ms. Bose: On September 18, 2018, El Paso Natural Gas Company, L.L.C. ("EPNG") received an informal request seeking clarification from the Office of Energy Projects Regulation ( OEP ) for environmental-related information pertaining to EPNG s South Mainline Expansion Project. EPNG is herein filing with the Federal Energy Regulatory Commission ("Commission") supplemental environmental information to the request. Description of Proceeding On April 27, 2018, EPNG submitted its application, pursuant to Section 7(c) of the Natural Gas Act requesting a certificate of public convenience and necessity for authorization to construct, own, and operate: 1) an approximate 17-mile 30 diameter loop line of its existing Line Nos and 1103 between Hueco and El Paso, Texas; 2) the new Red Mountain Compressor Station in Luna County, New Mexico; and 3) the new Dragoon Compressor Station located in Cochise County, Arizona. This project is referred to as the South Mainline Expansion Project. Description of Information Being Filed EPNG is herein providing supplemental environmental information, including certain attachments, intended to clarify previously submitted data. Filing Information EPNG is e-filing this letter and responses with the Commission's Secretary in accordance with the Commission's Order No. 703, Filing Via the Internet, guidelines issued on November 15, 2007 in Docket No. RM

2 Federal Energy Regulatory Commission -2- September 19, 2018 Respectfully submitted, EL PASO NATURAL GAS COMPANY, L.L.C. By /s/ Francisco Tarin Director, Regulatory Enclosures

3 EL PASO NATURAL GAS COMPANY, L.L.C. Supplemental Environmental Information South Mainline Expansion Project in Docket No. CP EPNG s June 28, 2018 response indicates that the revised Ambient Sound Survey and Acoustical Analysis for the Dragoon Compressor Station included with the response (Hoover and Keith Report No dated February 15, 2018) supersedes the original report in Appendix 9.D. The revised report no longer includes potential cumulative noise impacts of the existing Willcox Compressor Station, and indicates that the Dragoon Compressor Station would be constructed on a Greenfield site. The remainder of the application indicates that the Dragoon Station would be constructed on the site of the existing Willcox Station. Confirm that the Dragoon Compressor Station site is to be constructed at the site of the Willcox Station and that noise mitigation measures identified in Hoover and Keith Report No dated February 6, 2018 included in Appendix 9.D are applicable to the requested action. Confirm whether EPNG commits to employing all mitigation measures specified in the February 6, 2018 report. Response: The Ambient Sound Survey and Acoustical Analysis Report dated February 15, 2018 for the Dragoon Compressor Station that EPNG included in its June 28, 2018 data response incorrectly stated that the proposed Dragoon Compressor Station would be constructed on a Greenfield site. EPNG confirms that the proposed Dragoon Compressor Station is to be constructed at the site of the Willcox Station. Furthermore, EPNG confirms that the noise mitigation measures identified in Hoover and Keith Report No dated February 6, 2018 are applicable to the requested action and EPNG commits to employing all mitigation measures specified in that report.

4 EL PASO NATURAL GAS COMPANY, L.L.C. Supplemental Environmental Information South Mainline Expansion Project in Docket No. CP The refined modeling report for the combined emissions from the existing Willcox Compressor Station and proposed Dragoon Compressor Station is not found in Appendix 9.C, as indicated in section Provide a copy of this report. Response: Attached behind this response, EPNG is including a copy of the refined modeling report for the combined emissions from the existing Willcox Compressor Station and proposed Dragoon Compressor Station.

5 DRAFT TECHNICAL SUPPORT DOCUMENT TECHNICAL REVIEW AND EVALUATION OF APPLICATION FOR AIR QUALITY PERMIT NO (SIGNIFICANT PERMIT REVISION TO PERMIT NO ) EL PASO NATURAL GAS COMPANY, L.L.C. - WILLCOX COMPRESSION STATION I. INTRODUCTION This Class I Permit No (significant permit revision to Permit No.61325) is issued to El Paso Natural Gas Company, L.L.C. (EPNG), the Permittee, for the addition of a new compressor station consisting of a centrifugal compressor driven by a 13,000 HP natural gas fired combustion turbine, and a natural gas fired emergency generator. A. Company Information 1. Facility Name: El Paso Natural Gas Company, L.L.C. Willcox Compressor Station 2. Facility Location: N 32 06' 42", W ' 42" Arzberger Road, 6 miles E of Kansas Settlement Road Willcox, Cochise County, Arizona Mailing Address: El Paso Natural Gas Company, L.L.C E. Broadway, Suite 1680 Tucson, AZ 85711: B. Attainment Classification The facility location is classified as attainment or unclassifiable for all criteria pollutants. II. REVISION DESCRIPTION The new facility, the Dragoon Compressor Station, is proposed be constructed northeast of EPNG s existing Willcox Compressor Station, on the same land parcel. This compressor station will operate independently of the existing Willcox Compressor Station and will be dedicated toward mainline compression on the existing transmission pipelines. The existing Willcox Compressor Station will continue to provide compression on the lateral pipeline branching off of the mainline, servicing customers in Mexico. III. EMISSIONS The combustion turbine will be equipped with Solar s SoLoNOx lean-mix dry low NOx combustion system, which will limit NOx emissions to 15 parts per million by volume, dry (ppmvd), corrected to 15% oxygen (O2) and limit carbon monoxide (CO) emissions to 25 ppmvd, corrected to 15% O2. The potential to emit as a result of the above change, and the facility wide potential to emit before and after this change are provided in the Table 1 below.

6 Draft Technical Support Document p. 2 of 4 June 4, 2018 TABLE 1- FACILITY WIDE POTENTIAL TO EMIT Pollutant Potential to Emit, tons per year Before MPR #70818 After PM PM PM CO NO X SO VOC IV. MINOR NEW SOURCE REVIEW The increase in potential to emit for NOx is greater than the permitting exemption threshold of 20 tons/year. Thus, the change is subject to Minor New Source Review (minor NSR) requirements. The facility has opted to comply with the minor NSR requirements by performing a RACT (Reasonably Available Control Technology) analysis, and has proposed to comply with the New Source Performance Standards (NSPS) under 40 CFR 60 Subpart KKKK as RACT. Since the previous modeling performed in 2012 for Significant Permit Revision No indicated modeled emissions at 173 microgram, ADEQ performed an additional modeling analysis to ensure continued compliance with NAAQS. The results of this modeling analysis can be found in Section VII. V. NEW APPLICABLE REGULATIONS A. The new Solar turbine is subject to NSPS requirements under 40 CFR 60 Subpart KKKK. These requirements are applicable to turbines constructed after B. The new natural gas-fired emergency engine is subject to NSPS requirements under 40 CFR 60 Subpart JJJJ. The engine is also subject to National Emission Standards for Hazardous Air Pollutants (NESHAP) requirements under 40 CFR 63 Subpart ZZZZ. These requirements are met by complying with NSPS 40 CFR 60 Subpart JJJJ. C. In accordance with 40 CFR Subpart OOOOa, the facility will become subject to the applicable conditions of this subpart upon startup of the new Dragoon (Solar/Mars S) compressor. The basis for this applicability determination is found under 40 CFR 60 Subpart OOOOa, a(j), where a modification to a compressor station occurs when an additional compressor is installed at a compressor station. Thus, a modification to the Willcox Compressor Station will occur on installation of the additional compressor station. Thus the facility is subject to the applicable requirements for the control of greenhouse gases (GHG) under 40 CFR 60 Subpart OOOOa. Since the Solar compressor to be installed at the facility utilizes dry seals, and the pneumatic controllers are of no-bleed design, these are not subject to any requirements under 40 CFR 60 Subpart OOOOa. The collection of fugitive emissions components at the compressor station, is the only affected facility, and is subject to applicable requirements under 40 CFR a.

7 Draft Technical Support Document p. 3 of 4 June 4, 2018 VI. NEW MONITORING AND PERFORMANCE TEST REQUIREMENTS A. Solar Turbine 1. The Permittee is required to conduct annual performance tests for NOx in accordance with the performance test procedure in 40 CFR 60 Subpart KKKK. 2. Additionally, to demonstrate on going compliance with the emission limits, the Permittee is required to conduct periodic stack testing for NOx emissions using a portable analyzer in accordance with ASTM Test Method D6522. B. GHG and VOC Fugitive Emissions 1. The Permittee is required to develop an emissions monitoring plan that covers the collection of fugitive emissions components at compressor stations. 2. The Permittee is required to conduct an initial monitoring survey of the compressor stations within 60 days of the startup of Dragoon Compressor Station. 3. Subsequent surveys shall be conducted at least quarterly after the initial survey. VII. AMBIENT AIR IMPACT ANALYSIS The previous Prevention of Significant Deterioration (PSD) modeling indicated that the ambient impact (modeled concentration plus background concentration) for 1-hour NO 2 due to the emissions from the EPNG Willcox facility was 173 µg/m 3, approximately 92 percent of the NAAQS 188 µg/m 3. Although EPNG elected to conduct a RACT analysis for the new emission unit, ADEQ performed an additional modeling analysis to determine if such a modification would interfere with the attainment or maintenance of the NAAQS. ADEQ used the American Meteorological Society/Environmental Protection Agency Regulatory Model (AERMOD, version 16216r) for the modeling analysis. ADEQ used the Plume Volume Molar Ratio Method (PVMRM) to evaluate the compliance with 1-hour NO 2, which was consistent with the method used in the previous PSD modeling. Additionally, ADEQ used the same in-stack ratio, hourly ozone dataset and meteorological dataset as used in the PSD modeling. EPNG provided ADEQ the facility layout map, the stack parameters for the new stack, as well as the information for new buildings. The modeled results were summarized in Table 2 Ambient Impact from the existing emission units (µg/m 3 ) a Table 2: Modeled Results for 1-hour NO 2 Ambient Impact from the new emission unit (µg/m 3 ) b Total Ambient Impact (µg/m 3 ) c NAAQS (µg/m 3 ) a From TSD for Class I Significant Revision No Background concentration was included. b Based on the 98th percentile of the annual distribution of maximum daily 1-hour concentrations, averaged across the 5 years of meteorological data modeled. c This estimation is conservative since the highest impacts from the existing emission units and the new emission unit unlikely occurred at the same location at the same time

8 Draft Technical Support Document p. 4 of 4 June 4, 2018 Based on the modeled results above, it is concluded that the emissions from the new unit will not interfere with attainment and maintenance of the NAAQS for 1-hour NO 2. Considering the magnitude of the NOx emissions from the new emission unit (approximately 27 tpy), ADEQ also determined that the 8-hour ozone impacts due to the emissions from the new unit would be below the significant impact level (SIL) of 1.0 ppb. Based on the EPA s Modeled Emission Rates for Precursors (MERPs) Guidance, the most conservative MERP value for NOx that could result in the SIL of 1 ppb was 184 tpy. Therefore, it is concluded that the emissions from new unit will not interfere with attainment and maintenance of the NAAQS for ozone. VIII. LIST OF ABBREVIATIONS AAAQG... Arizona Ambient Air Quality Guideline A.A.C.... Arizona Administrative Code ADEQ... Arizona Department of Environmental Quality CFR... Code of Federal Regulations CO... Carbon Monoxide CO 2... Carbon Dioxide hp... Horsepower IC... Internal Combustion lb... Pound m... Meter MERP... Modeled Emission Rates for Precursors MMBtu... Million British Thermal Units g/m 3... Microgram per Cubic Meter NAAQS... National Ambient Air Quality Standard NESHAP... National Emission Standards for Hazardous Air Pollutants NSPS... New Source Performance Standards NO x... Nitrogen Oxide NO 2... Nitrogen Dioxide O 3... Ozone Pb... Lead PM...Particulate Matter PM Particulate Matter Nominally less than 10 Micrometers PSD... Prevention of Significant Deterioration PTE... Potential-to-Emit RACT... Reasonably Available Control Technology SIL... Significant Impact Level SO 2... Sulfur Dioxide EPA... Environmental Protection Agency VOC... Volatile Organic Compound yr... Year

9 EL PASO NATURAL GAS COMPANY, L.L.C. Supplemental Environmental Information South Mainline Expansion Project in Docket No. CP The referenced memorandum from RTP Environmental Associates, Inc., dated May 24, 2017, is not found in Appendix 9.C, as indicated in section Class I Area Impacts. Provide a copy of this memorandum. Response: Attached behind this response, EPNG is including a copy of the requested memorandum from RTP Environmental Associates, Inc. dated May 24, 2017.

10 304-A West Millbrook Road Raleigh North Carolina (919) Memorandum To: Richard Duarte, Kinder Morgan From: David Keen, RTP Environmental Date: May 24, 2017 Subject: Air Dispersion Modeling for Mars 90 at Willcox RTP Environmental has completed an air dispersion modeling analysis for a new Mars 90 turbine at the Kinder Morgan Willcox Station. We used the latest version of the EPAapproved dispersion model (AERMOD, version 16216r) and meteorological data obtained from a nearby AZMET monitoring station called the Kansas Settlement Station. These meteorological data were also processed with the most current version of EPA s meteorological processor (AERMET, version 16216). Please note that the Kansas Settlement Station became inactive as of June of While the historical data collected at this station would likely be adequate for minor source permitting at Willcox, site-specific meteorological monitoring data would likely be required for any future major source, PSD permitting. Should Kinder Morgan be considering any future major source permitting at this station, consideration should be given to establishing a meteorological monitoring station at the site. Initially, only the proposed new Mars 90 unit was modeled. The proposed eastern location of the unit was modeled. Maximum calculated concentrations were compared to the PSD significant impact levels (SIL). Only pollutants with an impact in excess of the SILs were further evaluated to assess compliance with the National Ambient Air Quality Standards (NAAQS) and PSD increments, were applicable. The current security fencing at the Willcox facility does not encompass the anticipated locations of the new turbine. We therefore created a new fence line as indicated in Figure 1 below. We understand that there is currently a three strand barbed wire fence at the location of the new fence. Generally, barbed wire fencing is not considered sufficient to preclude public access. The new turbine was modeled with the release parameters noted in Table 1. Modeled emissions are provided in Table 2. The NOx and CO emission rates were provided by the vendor. Emissions for the other pollutants were calculated based on AP-42, Section 3-1 emission factors (Table 3.1-2a) and a maximum turbine heat input rate of MMBtu/hr.

11 Figure 1. Revised Location of Willcox Security Fencing Model Source No. Source ID Source Description Table 1. Mars 90 Turbine Model Input Data Easting (X) (m) Northing (Y) (m) Base Elevation (ft) Stack Height (ft) Temp. (F) Exit Velocity (ft/sec) Stack Diameter (ft) 1C3 Mars Table 2. Mars 90 Turbine Modeled Emission Rates Model Source No. Source ID Source Description NO2 NOx SO2 SOx CO PM10 1C3 Mars PM2.5 The results of the SIL analysis are presented in Table 3. As shown, the proposed turbine will result in insignificant impacts for all pollutants except for the 1-hr NO2. 1-hr NO2 impacts were therefore evaluated to assess compliance with the NAAQS. There is no 1-hr NO2 increment, so an increment evaluation was not necessary. Background NO2 concentrations and the two existing turbines at Willcox were included in the analysis. The results of the NAAQS analysis are presented in Table 4. As shown, the facility as configured with the new Mars 90 will be compliant with the NAAQS. Page 2 of 3

12 Table 3. Significant Impact Analysis Results Pollutant Average Group Rank Conc/Dep. (ug/m3) Significance (ug/m3) % SIL NO2 1ST HIGHEST MAX DAILY 1 HR ALL 1ST % PERIOD ALL 1ST % SO2 1ST HIGHEST MAX DAILY 1 HR ALL 1ST % 3 HR ALL 1ST % 24 HR ALL 1ST % PERIOD ALL 1ST % CO 1 HR ALL 1ST % 8 HR ALL 1ST % PM10 24 HR ALL 1ST % PERIOD ALL 1ST % PM2.5 1ST HIGHEST 24 HR ALL 1ST % ANNUAL ALL 1ST % ARM2 used for NO2 with minimum and maximum ambient ratio of 0.2 and 0.5, respectively. Table 4. NAAQS Analysis Results Pollutant Average Group Rank Conc/Dep. (ug/m3) NAAQS (ug/m3) % NAAQS NO2 8TH HIGHEST MAX DAILY 1 HR ALL 1ST % Seasonal background values from Deming as obtained from Bowie Power 2010 PSD application. ARM2 used for NO2 with minimum and maximum ambient ratio of 0.2 and 0.5, respectively. Two existing Wilcox turbines included. Page 3 of 3

13 Certificate of Service I hereby certify that I have this day caused a copy of the foregoing documents to be served upon each person designated on the official service list compiled by the Commission's Secretary in this proceeding in accordance with the requirements of Section of the Federal Energy Regulatory Commission's Rules of Practice and Procedure. Dated at Colorado Springs, Colorado as of this 19 th day of September, /s/ Francisco Tarin Two North Nevada Avenue Colorado Springs, Colorado (719)